1 /* libs/opengles/mipmap.cpp
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 **     http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17 
18 #include <stdio.h>
19 #include <stdlib.h>
20 
21 #include "context.h"
22 #include "state.h"
23 #include "texture.h"
24 #include "TextureObjectManager.h"
25 
26 namespace android {
27 
28 // ----------------------------------------------------------------------------
29 
buildAPyramid(ogles_context_t * c,EGLTextureObject * tex)30 status_t buildAPyramid(ogles_context_t* c, EGLTextureObject* tex)
31 {
32     int level = 0;
33     const GGLSurface* base = &tex->surface;
34     const GGLFormat& pixelFormat(c->rasterizer.formats[base->format]);
35 
36     int w = base->width;
37     int h = base->height;
38     if ((w&h) == 1)
39         return NO_ERROR;
40 
41     w = (w>>1) ? : 1;
42     h = (h>>1) ? : 1;
43 
44     while(true) {
45         ++level;
46         const int bpr = w * pixelFormat.size;
47         if (tex->reallocate(level, w, h, w,
48                 base->format, base->compressedFormat, bpr) != NO_ERROR) {
49             return NO_MEMORY;
50         }
51 
52         int stride = w;
53         int bs = base->stride;
54         GGLSurface& cur = tex->editMip(level);
55 
56         if (base->format == GGL_PIXEL_FORMAT_RGB_565)
57         {
58             uint16_t const * src = (uint16_t const *)base->data;
59             uint16_t* dst = (uint16_t*)cur.data;
60             const uint32_t mask = 0x07E0F81F;
61             for (int y=0 ; y<h ; y++) {
62                 size_t offset = (y*2) * bs;
63                 for (int x=0 ; x<w ; x++) {
64                     uint32_t p00 = src[offset];
65                     uint32_t p10 = src[offset+1];
66                     uint32_t p01 = src[offset+bs];
67                     uint32_t p11 = src[offset+bs+1];
68                     p00 = (p00 | (p00 << 16)) & mask;
69                     p01 = (p01 | (p01 << 16)) & mask;
70                     p10 = (p10 | (p10 << 16)) & mask;
71                     p11 = (p11 | (p11 << 16)) & mask;
72                     uint32_t grb = ((p00 + p10 + p01 + p11) >> 2) & mask;
73                     uint32_t rgb = (grb & 0xFFFF) | (grb >> 16);
74                     dst[x + y*stride] = rgb;
75                     offset += 2;
76                 }
77             }
78         }
79         else if (base->format == GGL_PIXEL_FORMAT_RGBA_5551)
80         {
81             uint16_t const * src = (uint16_t const *)base->data;
82             uint16_t* dst = (uint16_t*)cur.data;
83             for (int y=0 ; y<h ; y++) {
84                 size_t offset = (y*2) * bs;
85                 for (int x=0 ; x<w ; x++) {
86                     uint32_t p00 = src[offset];
87                     uint32_t p10 = src[offset+1];
88                     uint32_t p01 = src[offset+bs];
89                     uint32_t p11 = src[offset+bs+1];
90                     uint32_t r = ((p00>>11)+(p10>>11)+(p01>>11)+(p11>>11)+2)>>2;
91                     uint32_t g = (((p00>>6)+(p10>>6)+(p01>>6)+(p11>>6)+2)>>2)&0x3F;
92                     uint32_t b = ((p00&0x3E)+(p10&0x3E)+(p01&0x3E)+(p11&0x3E)+4)>>3;
93                     uint32_t a = ((p00&1)+(p10&1)+(p01&1)+(p11&1)+2)>>2;
94                     dst[x + y*stride] = (r<<11)|(g<<6)|(b<<1)|a;
95                     offset += 2;
96                 }
97             }
98         }
99         else if (base->format == GGL_PIXEL_FORMAT_RGBA_8888)
100         {
101             uint32_t const * src = (uint32_t const *)base->data;
102             uint32_t* dst = (uint32_t*)cur.data;
103             for (int y=0 ; y<h ; y++) {
104                 size_t offset = (y*2) * bs;
105                 for (int x=0 ; x<w ; x++) {
106                     uint32_t p00 = src[offset];
107                     uint32_t p10 = src[offset+1];
108                     uint32_t p01 = src[offset+bs];
109                     uint32_t p11 = src[offset+bs+1];
110                     uint32_t rb00 = p00 & 0x00FF00FF;
111                     uint32_t rb01 = p01 & 0x00FF00FF;
112                     uint32_t rb10 = p10 & 0x00FF00FF;
113                     uint32_t rb11 = p11 & 0x00FF00FF;
114                     uint32_t ga00 = (p00 >> 8) & 0x00FF00FF;
115                     uint32_t ga01 = (p01 >> 8) & 0x00FF00FF;
116                     uint32_t ga10 = (p10 >> 8) & 0x00FF00FF;
117                     uint32_t ga11 = (p11 >> 8) & 0x00FF00FF;
118                     uint32_t rb = (rb00 + rb01 + rb10 + rb11)>>2;
119                     uint32_t ga = (ga00 + ga01 + ga10 + ga11)>>2;
120                     uint32_t rgba = (rb & 0x00FF00FF) | ((ga & 0x00FF00FF)<<8);
121                     dst[x + y*stride] = rgba;
122                     offset += 2;
123                 }
124             }
125         }
126         else if ((base->format == GGL_PIXEL_FORMAT_RGB_888) ||
127                  (base->format == GGL_PIXEL_FORMAT_LA_88) ||
128                  (base->format == GGL_PIXEL_FORMAT_A_8) ||
129                  (base->format == GGL_PIXEL_FORMAT_L_8))
130         {
131             int skip;
132             switch (base->format) {
133             case GGL_PIXEL_FORMAT_RGB_888:  skip = 3;   break;
134             case GGL_PIXEL_FORMAT_LA_88:    skip = 2;   break;
135             default:                        skip = 1;   break;
136             }
137             uint8_t const * src = (uint8_t const *)base->data;
138             uint8_t* dst = (uint8_t*)cur.data;
139             bs *= skip;
140             stride *= skip;
141             for (int y=0 ; y<h ; y++) {
142                 size_t offset = (y*2) * bs;
143                 for (int x=0 ; x<w ; x++) {
144                     for (int c=0 ; c<skip ; c++) {
145                         uint32_t p00 = src[c+offset];
146                         uint32_t p10 = src[c+offset+skip];
147                         uint32_t p01 = src[c+offset+bs];
148                         uint32_t p11 = src[c+offset+bs+skip];
149                         dst[x + y*stride + c] = (p00 + p10 + p01 + p11) >> 2;
150                     }
151                     offset += 2*skip;
152                 }
153             }
154         }
155         else if (base->format == GGL_PIXEL_FORMAT_RGBA_4444)
156         {
157             uint16_t const * src = (uint16_t const *)base->data;
158             uint16_t* dst = (uint16_t*)cur.data;
159             for (int y=0 ; y<h ; y++) {
160                 size_t offset = (y*2) * bs;
161                 for (int x=0 ; x<w ; x++) {
162                     uint32_t p00 = src[offset];
163                     uint32_t p10 = src[offset+1];
164                     uint32_t p01 = src[offset+bs];
165                     uint32_t p11 = src[offset+bs+1];
166                     p00 = ((p00 << 12) & 0x0F0F0000) | (p00 & 0x0F0F);
167                     p10 = ((p10 << 12) & 0x0F0F0000) | (p10 & 0x0F0F);
168                     p01 = ((p01 << 12) & 0x0F0F0000) | (p01 & 0x0F0F);
169                     p11 = ((p11 << 12) & 0x0F0F0000) | (p11 & 0x0F0F);
170                     uint32_t rbga = (p00 + p10 + p01 + p11) >> 2;
171                     uint32_t rgba = (rbga & 0x0F0F) | ((rbga>>12) & 0xF0F0);
172                     dst[x + y*stride] = rgba;
173                     offset += 2;
174                 }
175             }
176         } else {
177             ALOGE("Unsupported format (%d)", base->format);
178             return BAD_TYPE;
179         }
180 
181         // exit condition: we just processed the 1x1 LODs
182         if ((w&h) == 1)
183             break;
184 
185         base = &cur;
186         w = (w>>1) ? : 1;
187         h = (h>>1) ? : 1;
188     }
189     return NO_ERROR;
190 }
191 
192 }; // namespace android
193